The "Oh, man" avatar
It all started with the two avatars I made to commemorate the rescue in the Chilean mine. The alternate avatar (which I used when I wanted to express disbelief, concern, pleadingness, or thoughtfulness) was the first non-static avatar I made (meaning that it wasn't "one avatar for everything"). When I started the Halloween story, I replaced it with the second panel from that. This resulted in me expanding the use of the "Oh, man" avatar to explanations and other "soft" comments, and now means "well, you see..." rather than "Oh, man".
The "Mwahaha" avatar
Rick Griffin –who draws Housepets!– is writing An Infinitesimally Brief History of the World for NaNoWriMo. The first installment introduces The King of Cats and has him explore an early human settlement. I read it, enjoyed it, and was about to post the standard response of "Oh, I like how you did this and that", but then I realized something.
My avatar is a mouse. I usually don't give this much thought, but when I went to decide whether to use the "normal" avatar or the "oh, man" avatar, the following question struck me: what would a mouse's response be to this? What would a mouse think, especially after reading the following excerpt? Once you've read it, the association with the new avatar should become glaringly obvious.
[The King of the Cats] was baffled all over again as he was taken to the [human] cities where the fishing ships were cast off, and the merchants had their storehouses filled with grain. Again, they also had mice trouble.
“The mice just don’t listen when you talk to them!” the fisherman said, “I tells them, they’re not allowed on the ship! We don’t even have any food for them ’cept our lunches, but they get on them once in a while, ’specially the bigger ones.”
“I have all the latest in pottery technology,” the merchant said, “this model has a weighted lid, but all that does is make the mice work together to get into the storage. It’s maddening sometimes, spending all that work collecting the grain only to have vandals steal it, and they don’t even bother to close the lid when they’re done.”
It seemed to [The King of the Cats] that the human’s system was very susceptible to collapsing for as much work as they put into it. If they had such trouble with small things like mice, what happened if the mice organized?
The "facepalm" avatar
Finally we have the "facepalm" (some would say "face-paw") avatar. It's pretty self-explanatory. It came from the "Mystery advertisement" post preluding Jane's formal introduction. My only worry with it is that by simple virtue of having it, I may be tempted to use it even where my comment doesn't call for it.